studysmarter.fr

Checked 22 October 2026, 05:21 UTC · via 8.8.8.8
✗Problems found
14 passed 4 warnings 2 failed 3 info

SPF

fail

No SPF record found

Checks

  • ✗
    No SPF record
    No SPF record was found for this domain. SPF is important for preventing email spoofing. Add an SPF record to specify which servers are authorized to send email for your domain.
    #6

DMARC

fail

p=none (_dmarc.studysmarter.fr)

Found

Record
v=DMARC1; p=none; rua=mailto:postmaster+dmarc@studysmarter.de; fo=1
Found at
_dmarc.studysmarter.fr
External report address
mailto:postmaster+dmarc@studysmarter.de (not authorized)
TagValueMeaning
vDMARC1Version
pnonePolicy
ruamailto:postmaster+dmarc@studysmarter.deAggregate report addresses
fo1Failure reporting options

Checks

  • ✗
    Policy: none (monitoring only)
    DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:postmaster+dmarc@studysmarter.de
  • !
    Report address not authorized
    These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:postmaster+dmarc@studysmarter.de (needs studysmarter.fr._report._dmarc.studysmarter.de). Ask the report provider to publish the record, or check the address.
    #29

DKIM

warn

Selectors: s1, s2

Found

Selectors
s1, s2
_domainkey
NXDOMAIN
SelectorKeyFlags
s1RSA 2048 bits
s2RSA 1024 bits

Checks

  • ✓ Keys found: s1, s2 #7
    DKIM keys found for this domain with selectors: s1, s2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: s2 (1024 bits). Rotate to a 2048-bit key.
    #23
  • ✓ No problematic flags #24
    No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

warn

Not signed

Found

DNSKEY records
No (0)
DS at parent
No

Checks

  • !
    Not enabled
    DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8

MX

pass

5 mail servers

Found

PriorityHostRecordsReverse DNS
1aspmx.l.google.comA 142.251.127.27 AAAA 2a00:1450:4001:c21::1blcfrai-in-f27.1e100.net ✓ lcfrai-in-f27.1e100.net ✓
5alt1.aspmx.l.google.comA 142.250.147.27 AAAA 2a00:1450:4025:c01::1ard-in-f27.1e100.net ✓ rd-in-f26.1e100.net ✓
5alt2.aspmx.l.google.comA 172.253.152.26 AAAA 2a00:1450:4010:c22::1byulpptr-in-f26.1e100.net ✓ yulpptr-in-f27.1e100.net ✓
10alt3.aspmx.l.google.comA 192.179.20.27 AAAA 2404:6800:4000:1027::1ancboms-in-f27.1e100.net ✓ ncboms-in-f26.1e100.net ✓
10alt4.aspmx.l.google.comA 192.178.158.26 AAAA 2404:6800:4013:813::1blcdels-in-f26.1e100.net ✓ lcdels-in-f27.1e100.net ✓

Checks

  • ✓ 5 MX records #9
    Found 5 MX records for this domain.
  • ✓ All hosts resolve #10
    All MX records resolve to valid IP addresses.
  • ✓ All hosts have IPv6 #11
    All MX records resolve to IPv6 addresses.
  • ✓ Redundant MX hosts #12
    Found 5 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 5 MX records, which is within the recommended range (1-5).
  • ✓ No localhost targets #14
    No MX records pointing to localhost found.
  • ✓ No private IP addresses #15
    No MX records resolving to private IP addresses found.
  • ✓ No CNAME targets #22
    No MX records point to a CNAME.
  • ✓ Reverse DNS confirmed #30
    All 10 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 5 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
aspmx.l.google.comnone-
alt1.aspmx.l.google.comnone-
alt2.aspmx.l.google.comnone-
alt3.aspmx.l.google.comnone-
alt4.aspmx.l.google.comnone-

Checks

  • !
    Not configured
    MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.
    #32
  • i
    Not configured
    TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.
    #35
  • i
    Not used
    No MX host publishes TLSA records. DANE lets senders verify your mail server's certificate through DNSSEC; it requires DNSSEC on the MX host's zone.
    #36

BIMI

info

No BIMI record

Checks

  • i
    Not configured
    BIMI shows your logo next to your mail in supporting mail clients. It requires DMARC enforcement.
    #38